Complex phase behavior in aqueous solutions of poly(ethylene oxide)-poly(ethylethylene) block copolymers

Article Abstract:

The phase behavior of of poly(ethylene oxide)-poly(ethylethylene) block copolymers in aqueous solutions was investigated using small-angle X-ray scattering. The thermotropic mesomorphism displayed by the copolymers was found to evolve continuously into the lyotropic behavior characteristic of the short-chain amphiphiles. Structural measurements indicated that several features of the solution phase diagrams reflect the formation of stoichiometric complex of about three water molecules per ethylene oxide.

Molecular structure

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Interactions between surfaces in the presence of ideal adsorbing block copolymers

Article Abstract:

The interaction between two planar surfaces separated by a solution of ideal adsorbing block copolymers has been investigated. Analytical results were derived for a finite chain with discrete monomers and for the long chain limit. It was found that the pressure at long range is dominated by the longest nonadsorbing block while at shorter range there is a repulsion. The behavior of multiblock copolymers was examined by altering the monomer-wall interactions for each monomer.

Adsorption, Surface chemistry

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Comparing the morphology and phase diagram of H-shaped ABC block copolymers and linear ABC block copolymers

Article Abstract:

A combinatorial screening method was applied to investigate the morphology of H-shaped ABC block copolymers and compare them with linear ABC block copolymers based on the self-consistent theory (SCFT) for polymers. By changing the ratios of volume fractions of two A arms and two C arms, block copolymers with different architectures ranging from linear block copolymer to H-shaped block copolymer can be obtained.

Morphology (Biology), Morphology, Structure, Chemical properties

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